Exam 10: The t Test for Two Independent Samples

Using an independent-measures t,the 90% confidence interval for the difference between two population means ranges from 19 to 23.Based on this confidence interval,how big is the difference between the two sample means?

(Multiple Choice)

4.7/5

(85)

Question 61

If one sample has n = 4 and SS = 90 and a second sample has n = 8 and SS = 150,then the estimated standard error for the sample mean difference is 9 points.

(True/False)

4.8/5

(87)

Question 62

An independent-measures research study uses two samples,each with n = 15 participants.If the data produce a t statistic of t = 2.760,which of the following is the correct decision for a two-tailed hypothesis test?

(Multiple Choice)

4.8/5

(64)

Question 63

A researcher reports t(22)= 5.30,p < .01 for an independent-measures experiment.How many individuals participated in the entire experiment?

(Multiple Choice)

4.9/5

(76)

Question 64

Two samples,each with n = 8,produce an independent-measures t statistic of t = -2.15.Which of the following decisions is justified for a two-tailed test?

(Multiple Choice)

4.8/5

(85)

Question 65

For an independent-measures study,the width of a confidence interval estimating µ₁ - µ₂ depends on the size of the difference between M₁ and M₂.

(True/False)

4.9/5

(71)

Question 66

If two sample variances are not equal,the pooled variance will be closer to the larger of the two variances.

(True/False)

4.8/5

(86)

Question 67

For an independent-measures t statistic,the estimated standard error measures how much difference is reasonable to expect between the sample means for two samples selected from the same population.

(True/False)

4.9/5

(68)

Question 68

Two samples,each with n = 9 scores,produce an independent-measures t statistic of t = 2.00.If the effect size is measured using r²,what is the value of r²?

(Multiple Choice)

4.8/5

(74)

Question 69

One sample of n = 8 scores has a variance of s² = 6 and a second sample of n = 8 scores has a variance of s² = 10.If the pooled variance is computed for these two samples,then the value obtained will be ______.

(Multiple Choice)

4.9/5

(81)

Question 70

A researcher predicts that scores in treatment A will be higher than scores in treatment B.If the mean for the 10 participants in treatment A is 4 points higher than the mean for the 10 participants in treatment B and the data produce t = 2.095,what decision should be made?

(Multiple Choice)

4.8/5

(81)

Question 71

An independent-measures research study uses two samples,each with n = 10 participants.If the data produce a t statistic of t = 2.095,which of the following is the correct decision for a two-tailed hypothesis test?

(Multiple Choice)

4.8/5

(74)

Question 72

For an independent-measures t statistic,you typically must compute the pooled variance before calculating the estimated standard error.

(True/False)

4.8/5

(83)

Question 73

The data from an independent-measures research study produce a sample mean difference of 6 points and an estimated standard error of 2 points.If there are n = 8 scores in each sample,what is the value for the t statistic?

(Multiple Choice)

4.9/5

(93)

Question 74

One sample has n = 10 scores and a variance of s² = 20,and a second sample has n = 15 scores and a variance of s² = 30.What can you conclude about the pooled variance for these two samples?

(Multiple Choice)

4.8/5

(73)

Question 75

If two separate samples have M₁ = 10 and M₂ = 18 with a pooled variance of 16,then Cohen's d = 0.50.

(True/False)

4.8/5

(70)

Question 76

One sample has M = 18 and a second sample has M = 14.If the pooled variance for the two samples is 16,what is the value of Cohen's d?

(Multiple Choice)

4.8/5

(78)

Question 77

One sample has a variance of s² = 10 and a second sample has a variance of s² = 6.Which of the following most accurately describes the pooled variance for the two samples?

(Multiple Choice)

4.9/5

(81)

Question 78

Which of the following research situations would be most likely to use an independent-measures design?

(Multiple Choice)

4.8/5

(81)

Question 79

What is assumed by the homogeneity of variance assumption?

(Multiple Choice)

4.7/5

(89)

Question 80

Showing 61 - 80 of 84

Using an independent-measures t,the 90% confidence interval for the difference between two population means ranges from 19 to 23.Based on this confidence interval,how big is the difference between the two sample means?

If one sample has n = 4 and SS = 90 and a second sample has n = 8 and SS = 150,then the estimated standard error for the sample mean difference is 9 points.

An independent-measures research study uses two samples,each with n = 15 participants.If the data produce a t statistic of t = 2.760,which of the following is the correct decision for a two-tailed hypothesis test?

A researcher reports t(22)= 5.30,p < .01 for an independent-measures experiment.How many individuals participated in the entire experiment?

Two samples,each with n = 8,produce an independent-measures t statistic of t = -2.15.Which of the following decisions is justified for a two-tailed test?

For an independent-measures study,the width of a confidence interval estimating µ₁ - µ₂ depends on the size of the difference between M₁ and M₂.

If two sample variances are not equal,the pooled variance will be closer to the larger of the two variances.

For an independent-measures t statistic,the estimated standard error measures how much difference is reasonable to expect between the sample means for two samples selected from the same population.

Two samples,each with n = 9 scores,produce an independent-measures t statistic of t = 2.00.If the effect size is measured using r²,what is the value of r²?

One sample of n = 8 scores has a variance of s² = 6 and a second sample of n = 8 scores has a variance of s² = 10.If the pooled variance is computed for these two samples,then the value obtained will be ______.

A researcher predicts that scores in treatment A will be higher than scores in treatment B.If the mean for the 10 participants in treatment A is 4 points higher than the mean for the 10 participants in treatment B and the data produce t = 2.095,what decision should be made?

An independent-measures research study uses two samples,each with n = 10 participants.If the data produce a t statistic of t = 2.095,which of the following is the correct decision for a two-tailed hypothesis test?

For an independent-measures t statistic,you typically must compute the pooled variance before calculating the estimated standard error.

The data from an independent-measures research study produce a sample mean difference of 6 points and an estimated standard error of 2 points.If there are n = 8 scores in each sample,what is the value for the t statistic?

One sample has n = 10 scores and a variance of s² = 20,and a second sample has n = 15 scores and a variance of s² = 30.What can you conclude about the pooled variance for these two samples?

If two separate samples have M₁ = 10 and M₂ = 18 with a pooled variance of 16,then Cohen's d = 0.50.

One sample has M = 18 and a second sample has M = 14.If the pooled variance for the two samples is 16,what is the value of Cohen's d?

One sample has a variance of s² = 10 and a second sample has a variance of s² = 6.Which of the following most accurately describes the pooled variance for the two samples?

Which of the following research situations would be most likely to use an independent-measures design?

What is assumed by the homogeneity of variance assumption?

Introduction to Statistics.

Frequency Distributions.

Central Tendency.

Variability.

z-Scores: Location of Scores and Standardized Distributions.

Probability.

Probability and Samples: The Distribution of Sample Means.

Introduction to Hypothesis Testing.

Introduction to the t Statistic

The t Test for Two Related Samples

Introduction to Analysis of Variance

Repeated-Measures and Two-Factor Analysis of Variance

Correlation and Regression.

The Chi-Square Statistic: Tests for Goodness of Fit and Independence

Filters